DBZ's Goku x Chichi, Vegeta x Bulma and Kuririn x Android 18 - Well, Vegeta x Bulma never kissing is understandable, he might have just raped her to make Trunks. Goku is just a boy in a man's body same as Kuririn

Yu Yu Hakusho's Kazuma Kuwabara x Yukina - Well, if only he knew that she was Hiei's sister...

Kouru and Luna from Uninhabited planet survival: Though they aren't exactly a couple, they might as well be. And I'm sure everyone pretty much expected them to end up together with the way Luna eventually got him to warm up to her.

Karin and Usui from Chibi Vampire Karin: I haven't read the manga all the way through, but I'm pretty sure they never really kissed.

Thats really all thats off the top of my head. I'm sure most of the obvious ones have been covered by now.

DBZ's Goku x Chichi, Vegeta x Bulma and Kuririn x Android 18 - Well, Vegeta x Bulma never kissing is understandable, he might have just raped her to make Trunks. Goku is just a boy in a man's body same as Kuririn

Yu Yu Hakusho's Kazuma Kuwabara x Yukina - Well, if only he knew that she was Hiei's sister...